JEE Advanced 2015 Paper 2 Chemistry Q6

Chemistry · Free Energy & Chemical Equilibrium · Solutions, Mixtures & Activities

Problem

The molar conductivity of a solution of a weak acid

\ce{HX}

(

0.01\,\mathrm{M}

) is 10 times smaller than the molar conductivity of a solution of a weak acid

\ce{HY}

(

0.10\,\mathrm{M}

). If

\lambda^\circ_{\ce{X^-}}\approx\lambda^\circ_{\ce{Y^-}}

, the difference in their

pK_a

values,

pK_a(\ce{HX})-pK_a(\ce{HY})

, is (consider degree of ionization of both acids to be

\ll1

)